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Diffstat (limited to 'src/cpu/kvm/timer.cc')
-rw-r--r-- | src/cpu/kvm/timer.cc | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/cpu/kvm/timer.cc b/src/cpu/kvm/timer.cc new file mode 100644 index 000000000..059d70f6b --- /dev/null +++ b/src/cpu/kvm/timer.cc @@ -0,0 +1,112 @@ +/* + * Copyright (c) 2012 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#include <csignal> +#include <ctime> + +#include "base/misc.hh" +#include "base/trace.hh" +#include "cpu/kvm/timer.hh" +#include "debug/KvmTimer.hh" + + +PosixKvmTimer::PosixKvmTimer(int signo, clockid_t clockID, + float hostFactor, Tick hostFreq) + : BaseKvmTimer(signo, hostFactor, hostFreq), + clockID(clockID) +{ + struct sigevent sev; + + // TODO: We should request signal delivery to thread instead of + // the process here. Unfortunately this seems to be broken, or at + // least not work as specified in the man page. + sev.sigev_notify = SIGEV_SIGNAL; + sev.sigev_signo = signo; + sev.sigev_value.sival_ptr = NULL; + if (timer_create(clockID, &sev, &timer) == -1) + panic("timer_create"); +} + +PosixKvmTimer::~PosixKvmTimer() +{ + timer_delete(timer); +} + +void +PosixKvmTimer::arm(Tick ticks) +{ + struct itimerspec ts; + memset(&ts, 0, sizeof(ts)); + + ts.it_interval.tv_sec = 0; + ts.it_interval.tv_nsec = 0; + ts.it_value.tv_sec = hostNs(ticks) / 1000000000ULL; + ts.it_value.tv_nsec = hostNs(ticks) % 1000000000ULL; + + DPRINTF(KvmTimer, "Arming POSIX timer: %i ticks (%is%ins)\n", + ticks, ts.it_value.tv_sec, ts.it_value.tv_nsec); + + if (timer_settime(timer, 0, &ts, NULL) == -1) + panic("PosixKvmTimer: Failed to arm timer\n"); +} + +void +PosixKvmTimer::disarm() +{ + struct itimerspec ts; + memset(&ts, 0, sizeof(ts)); + + DPRINTF(KvmTimer, "Disarming POSIX timer\n"); + + if (timer_settime(timer, 0, &ts, NULL) == -1) + panic("PosixKvmTimer: Failed to disarm timer\n"); +} + +Tick +PosixKvmTimer::calcResolution() +{ + struct timespec ts; + + if (clock_getres(clockID, &ts) == -1) + panic("PosixKvmTimer: Failed to get timer resolution\n"); + + Tick resolution(ticksFromHostNs(ts.tv_sec * 1000000000ULL + ts.tv_nsec)); + + return resolution; +} |